Globe-holder for arc-lamps, &amp;c.



PATENTED FEB. 10, 1903.

J. J. WOOD. GLOBE HOLDER FOR ARO LAMPS, &0.

APPLICATION FILED FEB. 25, 1902 H0 MODEL.

FIG.

WITNESSES:

fiyne By A zfomeys,

r NORRIS PETERS co. FNOTO-LITH 1 UNITED STATES PATENT OFFICE.

JAMES J. WOOD, OF FORT WAYNE, INDIANA.

GLOBE-HOLDER FOR ARC-LAMPS, 80c.

SPECIFICATION forming part of Letters Patent No. 720,306, dated February10, 1903.

Application filed February 25, 1902. Serial No. 95,585. (No model.)

To all whom, it may concern:

Be it known that I, JAMns J. WOOD, a citizen of the United States,residing at Fort WVayne, in the county of Allen and State of Indiana,have invented certain new and useful Improvementsin Globe-Holders forAre- Lamps, &c., of which the following is a specification.

This invention provides a globe-holder that is designed, primarily, forfastening the globe of an electric-arc lamp, although applicable also tothe fastening of other globes to their holders or carriers.

Figure 1 of the accompanying drawings is a side elevation of an arc-lampwith its globeholder detached. Fig. 2 is a section, on a larger scale,of the globe and globe-holder in place. Fig. 3 is a transverse section,on a still larger scale, taken through the globe fastening or clampingscrew. Fig. 4 shows a detail of the globe-fastener. Fig. 5 is a viewsimilar to Fig. 3, but showing a modified construction.

Let A designate an arc-lamp body or casing of any suitable kind, a beingthe lower portion of the body thereof, which is shown as having adepending flange b.

B is a globeholder or carrier,which is shown as formed with a neck 0,entering within the flange b and detachably engaged therewith.

O is a globe fastened to the holder B. The holder is shown in the normalposition in Fig. 2, while in Fig. 1 it is shown as disconnected anddropped, so as to be suspended by a chain (1.

My invention relates to the clamping devices for fastening the globe Oto the globeholder B. It is usual to fasten these globes by means ofset-screws screwing through the globe-holder and bearing at their innerends against the grooved neck of the globe, three such screws beingcommonly used. Suchsetscrews, however, are liable to break the globe bybeing screwed up too tight. According to my invention I form the globeand holder so that the former fits loosely or freely within the latterand is hung or suspended upon springs which are carried by the holderand fit into a depression formed in the globe. The springs arepreferably 1eaf springs and are mounted to receive inward pressure toforce them against the globe. The pressing- ,or tilting motion withinthe holder.

in devices are most simply made as clamping-screws carried by theholder, to the inner ends of which screws the springs are swiveled. Eachspring is preferably bowed outwardly at its middle, so that its two endsalone engage the neck of the globe. Thus the screws instead of bearingdirectly upon the globe each at a single point bear indirectly thereon,their pressure being communicated to the globe through yielding orelastic mediums and preferably transmitted to two or more points,whereby it is equalized. I have shown clamping-screws D D, of whichpreferably there are three, these screws preferably engaging threads ina bushing or reinforce e in the holder B. Each screw has swiveled on itsinner end an equalizingspring E, as best shown in Fig. 3, this springbeing preferably of the shape shown separately in Fig. 4. 'The middlehole f in the spring is engaged loosely by a neck on the inner end ofthe screw, so that the spring may rock sufficiently to adapt itself toany inequality in the globe, the screw having an inner head g, adaptedto prevent the spring dropping off when unscrewed. The inner ends of thespring are bent toward the globe, the ends being preferably roundedtransversely to fit the neck and the spring being preferably bowed, asshown. As pressure is put upon the screw it forces the middle portion ofthe spring inward, and the pressure is transmitted yieldingly to theends of the spring which bear upon the globe. The globe is thussuspended upon the springs, so that it has no rigid connection with theholder,.but, on the contrary, is capable of a slight lateral As a resultof this construction any shocks to which the holder may be subjected aretaken up by the springs. A further result is that as the pressure of thescrew is applied to the globe at two points instead of one andyieldingly instead of rigidly it is almost impossible to break the globeby screwing in the clampingscrews too hard. My invention thus introducesthe novel feature of suspending the globe flexibly or elastically fromthe holder, while providing for the interposition of a yielding mediumbetween the clampingscrews and the globe, so that the pressure of thescrews is yieldingly transmitted to the globe. The loose connectionsbetween the springs and the screws permit the spring to rock, so thatboth ends of the spring exert substantially the same pressure upon theglobe.

As a suggestion of one among several modifications of which my inventionis susceptible, I have shown in Fig. 5 a rigid equalizingbar E, carryingon its ends two separate springs F F.

Other modifications will readily suggest themselves to those skilled inthe art without departing from my invention.

I am aware that it has been proposed in signaling devices to form a bulband its holder so that the neck of the bulb fits closely within theholder, which latter is disposed in a horizontal position, a fasteningdevice being provided to prevent the bulb from sliding horizontally outof the holder. In addition to the fact, however, that such bulbs aredistinguished from my present invention in form, disposition, and use,the connection between the holder and bulb being a rigid one is very aptto result in the breakage of the latter.

\Vhat I claim is 1. In an electric-arc lamp, the combination of a globeand its holder, the holder having a pendent portion for receiving theneck of the globe, and the globe having a neck fitting loosely withinsaid portion, with means for suspending said globe from the holdercomprising springs carried by said holder and engaging the neck of theglobe, said springs adapted to yieldingly support said globe in suchmanner that the latter will be capable of lateral movement within theholder.

2. In an electric-arc lamp, the combination of a globe and its holder,the holder having a pendent portion for receiving the neck of the globe,and the globe having a neck fitting loosely Within said portion, withmeans for suspending said globe from the holder comprising devices forexerting an inward pressure against the globe to hold it, andequalizing-springs bearing at their ends against the neck of the globe,and loosely swiveled to such devices for yieldingly transmitting theirpressure to the globe.

3. In an electric-arc lamp, the combination of a globe and its holder,the holder having a pendent portion for receiving the neck of the globe,and the globe having a neck fitting loosely within said portion, withmeans for suspending said globe from the holder comprising screwspassing through said holder,

and equalizing-springs loosely swiveled to said screws, and yieldinglytransmitting the pressure of said screws to the neck of the globe, saidscrews having inner heads g for confining said springs.

4. In an electric-arc lamp, the combination of a globe and its holder,the holder havinga pendent portion for receiving the neck of the globe,and the globe having a neck fitting loosely within said portion, withmeans for suspending said globe from the holder comprising screwspassing through said holder, bushings for said screws held in saidholder, and equalizing-springs loosely swiveled to said screws foryieldingly transmitting the pressure of said screws to the neck of theglobe.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

JAMES J. WOOD.

Witnesses:

A. A. SERVA, W. F. MELCHING.

